In a triangle, we use terms like adjacent and opposite. These refer to sides in relation to angles. In our musical triangle, the drummer is at one angle in the back. This side, where the audience is, is called the opposite side.
Trunc is database function, try using round for numeric values, or change the Processing of Query to database.
The primary trigonometric functions are the sine and cosine of an angle. These are sometimes abbreviated sin(Î¸) and cos(Î¸), respectively, where Î¸ is the angle, but the parentheses around the angle are often omitted, e.g., sin Î¸ and cos Î¸.